PUL fabric is available at Hobby Lobby, Joann Fabrics, & other sewing stores. It provides a water proof barrier. It can be pricey but you don't need much. Mine was $12.99p/y . I had a 40% off coupon.
I bought half a yard of PUL and it only cost me $4. I had all my other supplies already. Shop for your absorbent fabrics in the scrap bin section of your store. You don't need much for this project.
more finished looking. You can cut the flannel exactly the same as the rest of the layers and stack them just as you would the rest. I did that on my other pairs.
Remember, we want the kid to know they've wet themselves, so don't make it too thick. Unless your kid is a super pee-er... In that case, go nuts.😉
I finished both ends of the absorbent liner that way, then I started sewing it into the underwear. 🙌STOP! Make sure you have the correct side of liner against the underwear!
I'm just making these for my son so I don't need them to be perfect, I just want them to work- so as I sewed them I flipped back and forth between doing it inside out and right side out.
Make sure that as you sew your liner near the leg holes that you leave enough distance there that the leg holes are snug(ish) around the toddler's leg. You don't want any icky stuff escaping!
You can do this on Gerber training pants too- just add the PUL fabric to the outside. Don't be afraid to experiment and see what works for you. Here are tons of tips on the Internet! Happy sewing!